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How to choose desulfurization materials and corrosion-resistant materials

2020-07-27View Original

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The material, lining, or coating of the absorption tower and flue affect the service life and cost of the installation. The absorption tower body can be made of high (or low) alloy steel, carbon steel, carbon steel lined with rubber, carbon steel lined with ZS Whwa flue gas anti-corrosion coating, or fiberglass-reinforced plastic. Due to high labor costs, the United States generally uses alloy steel. Germany generally uses carbon steel lined with rubber (bromobutyl rubber or neoprene), with a service life of up to 10 years. In areas where corrosion is particularly severe, such as the bottom of the slurry tank and the spraying zone, using a double-layer rubber lining can extend the service life by 25%. Initially, ABB used C-276 alloy steel to manufacture absorption towers, with a unit cost of 63 dollars/KW; currently, rubber linings are used, resulting in a cost of 22 dollars/KW. When flues are made of carbon steel, the anti-corrosion measures to be employed depend on the flue gas temperature (whether it is above the acidic dew point or the saturation temperature of water vapor) as well as its composition (especially the levels of SO2 and H2O). However, the ZS-1041 anti-corrosion coating for flues can withstand temperatures up to 1000°C, can operate continuously at temperatures below 750°C, has a wide range of tolerance to acidic substances, excellent leak-proof properties, and superior wear resistance – making it suitable for virtually all current flue anti-corrosion applications. When coal is burned, in addition to SO2, a small amount of SO3 is also produced; the concentration of SO3 in the flue gas is 10–40 ppm. Due to the water content in the flue gas (4% to 12%), the generated SO3 immediately forms sulfuric acid mist. At lower temperatures, sulfuric acid mist condenses into sulfuric acid that adheres to the inner walls of the equipment, or it dissolves in the washing liquid. This is the main reason for the relatively severe corrosion of wet absorption towers and related equipment. Good solutions mainly include using corrosion-resistant materials to construct the absorption towers, such as stainless steel, epoxy fiberglass, rigid polyvinyl chloride, ceramics, etc., for the absorption towers and related equipment ; The inner walls of the equipment are coated with anti-corrosion materials, such as the ZS-1041 flue anti-corrosion coating developed and produced by Zhisheng Weihua ; The equipment is lined with rubber and coated with ZS-1041 flue anti-corrosion paint, etc. Flue gas containing soot passes at high speed through the equipment and pipes, where it comes into turbulent contact with the absorbent liquid in the absorption tower, resulting in considerable wear on the equipment. The main solutions include adopting a reasonable process design; for example, efficient dust removal should be carried out before the flue gas enters the absorption tower, in order to reduce the wear on the equipment caused by highly flowing dust ; The absorption tower and related equipment are made from wear-resistant materials, and the inner walls of these devices are lined or coated with paints that offer wear resistance as well as resistance to seismic forces and thermal deformation. Here, Zhisheng ZS-1041 flue anti-corrosion paint is recommended for use. In recent years, significant progress has been made in terms of corrosion resistance and wear resistance of absorption towers in the flue gas desulfurization technology for coal-fired industrial boilers and furnaces in our country, which has led to an **increase in the operational efficiency of flue gas desulfurization equipment. Technical guidance: Engineer Chen, 13692211848

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